High-bandwidth high-accuracy rotary microactuators for magnetic hard disk drive tracking servos

Hirano, T.; Fan, Long-Sheng; Lee, Wen Y.; Hong, John; Imaino, W.; Patanaik, S.; Chan, S.; Webb, Patrick; Horowitz, Roberto; Aggarwal, Sheilza; Horsley, David A.

doi:10.1109/3516.712111

Cited by 67 publications

(25 citation statements)

References 7 publications

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“…There are several types of dual-stage system designs, which can be classified by the locations of micro actuators. The micro actuator can be placed at E-block [2], attached to slider [3], inserted next to the read/write head [4] or attached on the suspension [5]. In the suspension-based actuator design, it needs to modify the original suspension structure for the adhesion of two piezoelectric micro actuators.…”

Section: Introductionmentioning

confidence: 99%

Precision Positioning of Hard Disk Drives Using Piezoelectric Actuators with Passive Damping

Chan

Liao

2006

2006 International Conference on Mechatronics and Automation

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Positioning precision is crucial to today's increasingly high-speed, high-capacity, high data density, and miniaturized hard disk drives (HDDs). The demand for higher bandwidth servo systems that can quickly and precisely position the read/write head on a high track density becomes more pressing. Recently, the idea of applying dual-stage actuators to track servo systems has been studied. The push-pull piezoelectrically actuated devices have been developed as micro actuators for fine and fast positioning, while the voice coil motor functions as a large but coarse seeking. However, the current dual-stage actuator design uses piezoelectric patches only without passive damping. In this paper, we propose a dual-stage servo system using enhanced active-passive hybrid piezoelectric actuators. The proposed actuators will improve the existing dualstage actuators for higher precision and shock resistance, due to the incorporation of passive damping in the design. We aim to develop this hybrid servo system not only to increase speed of track seeking but also to improve precision of track following servos in HDDs. New piezoelectrically actuated suspensions with passive damping have been designed and fabricated. In order to evaluate positioning precision for the dual-stage servo systems, simulation and experiments are carried out to implement the active-passive hybrid suspension with enhanced piezoelectric actuators using a composite nonlinear feedback controller.Index Terms -hard disk drive, precision positioning, piezoelectric actuator, dual-stage servo system, active-passive hybrid

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Section: Introductionmentioning

confidence: 99%

Precision Positioning of Hard Disk Drives Using Piezoelectric Actuators with Passive Damping

Chan

Liao

2006

2006 International Conference on Mechatronics and Automation

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“…Fan et al (1995) implemented a milli-actuator, which is a micro-actuator that operates at the slider level instead of at the suspension level. A more in-depth analysis of the milli-actuator proposed by Fan et al, was presented by Hirano et al (1998). Horsley et al (1999) used parallelplate capacitive electrodes to generate an electrostatic force, which was used to drive an actuator.…”

Section: Dual Stage Actuator Headmentioning

confidence: 99%

Design of a dual stage actuator tape head with high-bandwidth track following capability

et al. 2009

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As tape recording density increases, high-frequency track following capability of the tape head actuator becomes more important. This paper details the mechanical design and experimental analysis of a dual state actuator tape head. The dual stage actuator design combines a traditional voice coil motor for low frequency track following with a piezoelectric actuator for high-frequency track following. Non-parametric and parametric modeling techniques are used in the analysis of the dual stage actuator. The performance of the dual stage actuator head shows good correlation with the model and will enable improved track following capability for future high-performance tape drives.

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“…Muller's group (Tang, Nguyen and Howe, 1992), and the rotary electrostatic micro motor (Fan, Tai and Muller, 1989;Hirano and Fan, 1998 (Ahn, Ki and Allen, 1993;Guckel, 1998;Guckel and Christenson, 1993). Even though electromagnetic actuation employed in conventional motors or solenoids is the most successful principle used on a macro scale, MEMS magnetic devices are still relatively unestablished.…”

mentioning

confidence: 99%

“…This is due to the fact that 3D coils are difficult to fabricate by typical MEMS technologies. Successful commercial devices are magnetic read/write heads for computer disk drives (Hirano and Fan, 1998).…”

mentioning

confidence: 99%

Driving Performance of Liquid Crystalline Actuators

Zhu

Tsuji

Chono

2011

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D

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Firstly, we investigated the motion trajectory and the maximum driving force of liquid crystalline actuators. The driving force of liquid crystalline actuator, which is one of the most important performances of actuators, has not been measured, since the force is too small to be measured directly using force sensors. In this research, we have tried to establish a way to estimate the force by analyzing the images of the driving actuators. From the estimated force, the applicability of the liquid crystalline actuators to the micro-devices is discussed.The second step is to measure the output power, input power and energy efficiency of liquid crystalline actuators. As a capacitor, the input energy of liquid crystalline actuator is very difficult to be measured, because the time for charging is very short and the current is too small to be buried in the noise from the experimental environment. In this research, we used the power meter of PPA5500 (N4L) which can measure the precision power. From the energy efficiency, we will evaluate the capability of liquid crystalline actuators.Thirdly, from the results we measured, we proposed the way to improve the performance and affordability of liquid crystalline actuators by optimizing the mechanical properties of liquid crystalline materials, the input parameters and the actuator geometry.

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High-bandwidth high-accuracy rotary microactuators for magnetic hard disk drive tracking servos

Cited by 67 publications

References 7 publications

Precision Positioning of Hard Disk Drives Using Piezoelectric Actuators with Passive Damping

Precision Positioning of Hard Disk Drives Using Piezoelectric Actuators with Passive Damping

Design of a dual stage actuator tape head with high-bandwidth track following capability

Driving Performance of Liquid Crystalline Actuators

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